Rhinotorus compactor ( Thunberg, 1822 )

Reshchikov, Alexey V., 2016, A revision of the genus Rhinotorus Förster, 1869 (Hymenoptera, Ichneumonidae, Ctenopelmatinae), with descriptions of three new species and an illustrated identification key, European Journal of Taxonomy 235 (235), pp. 1-40 : 10-13

Rhinotorus compactor ( Thunberg, 1822)

Fig. 5

Ichneumon compactor Thunberg, 1822: 273 , lectotype examined.

Polyblastus albotrochanteratus Strobl, 1903: 61 .

Trematopygus atratus Holmgren, 1857: 181 , lectotype examined.

Bassus quadriguttatus Vollenhoven, 1873: 197 .

Mesoleius compactor var. rufomedia Teunissen, 1953: 33 .

Diagnosis

This species is distinguished from other species in the genus by the following characters: metasoma black ( Fig. 5I ); face and mesopleuron shining, rather densely and distinctly punctate ( Fig. 5 A–B, H); face and clypeus strongly projecting; hind tibia entirely black ( Fig. 5I ); metasomal tergites 1–3 strongly punctate and with strong transverse impressions ( Fig. 5E ).

Type material examined

Ichneumon compactor Thunberg, 1822: 273 . Holotype ♀, SWEDEN, UUZM.

Trematopygus atratus Holmgren,1857:181 . Holotype ♀, SWEDEN, Lappland ,NHRS-HEVA000001983, NHRS.

Other material examined

AUSTRIA: 1 Ƌ, BMNH.

BELGIUM: 1 ♀, Brabant, Bois de Rixensart, 2 Jun. 1961, leg. B.K. & R.D. Eady, BMNH.

DENMARK: 1 Ƌ, Å. Øle, BMNH; 9 ♀♀, leg. Schiødte, ZMUC.

FINLAND: 1 ♀, Helsinki, Munkkiniemi, 1947, leg. M. Häyrynen, MZH; 1 ♀, 7 ƋƋ, Pirkanmaa, Ruovesi, 1932, leg. Saarinen, MZH; 1 Ƌ, Uusimaa, Huopalahti, 1945, leg. Saarinen, MZH; 1 Ƌ, Åboland, Houtskär, 1992, leg. J. Waselius, MZH; 2 ƋƋ, Åboland, Pernå, 26 Jun. 1944, leg Å.Nordström, MZH.

RUSSIA: 1 ♀, Semojärvi, leg. J. Carpelan, MZH; 1 ♀, Sakha, Yakutsk, 9–10 km Vilyuysk road, 22 Jul. 1970, leg. D. Kasparyan, ZIN.

POLAND: 1 ♀, Wrocław, Sępolno, leg. G. Heinrich, NHRS-HEVA000002059, NHRS.

SWEDEN: 3 ♀♀, Småland, leg. C. Boheman, NHRS; 5 ♀♀, Torne lappmark, Torneträsk, 28 Jul. 1910, leg. R. Malaise, NHRS.

U.K.: 1 ♀, England, Surrey, Claygate, 23 May 1937, leg. E.B. Britton, BMNH; 2 ♀♀, England, Esher, 3 May 1953, leg. D.M.S. Perkins, BMNH; 1 ♀, England, Essex, Colchester, 1903, Harwood coll., BMNH; 1 ♀, Harwood coll., BMNH.

Description

Female

Fore wing about 6–9 mm long. Antenna slender, around 1.2 times as long as fore wing, with 34–36 flagellomeres. Ratio of length of 1 st plus 2 nd flagellomeres to eye height 1.1. Scape 1.6 times as long as broad. Head not narrowed behind eyes, matt, with dense, strong punctures on a shagreened surface ( Fig. 5F ). Lateral ocellus separated from eye margin by 1.6 times their widest diameter. Face transverse, 1.9 times as broad as long, with dense punctures ( Fig. 5 A–B). Clypeus 0.4 times as high as wide, distinctly separated from face by a deep impression, strongly projecting medially, shining and sparsely punctate, its apical margin obtuse medially and impressed laterally. Clypeal fovea deep. Malar space 0.7 times basal mandible width. Occipital carina complete. Mandible teeth of equal length.

Mesoscutum weakly shining, finely granulate, with dense and coarse uniform punctation. Notaulus distinct. Mesopleuron finely granulate, striated in upper part, shining, distinctly densely and strongly punctate ( Fig. 5H ). Metapleuron weakly shining, rugose, with rather dense but vague punctation in upper part. Propodeum strongly rugose ( Fig. 5D ). Area superomedia fused with area basalis, their combined area 2.6 times as long as broad. Costula absent. Area apicalis trapezoidal, 0.6 as long as broad, and equal to 0.5 of propodeum, often with longitudinal carina and sometimes with striation. Spiracles weakly oval, 1.56 times as long as broad. Hind femur 5 times as long as broad. Hind tibia 7.9 times as long as apically broad. First tarsomere of hind leg 6.7 times as long as broad and 2.1 times as long as second tarsomere. Claws not pectinate. Fore wing with pterostigma elongate, around 3 times as long as broad and intercepted by Rs before its middle. 2m-cu straight, with a single bulla. Cu-a vertical, slightly postfurcal. Hind wing with 1/Cu & cu-a intercepted by 2/Cu in lower 0.5.

Metasoma coarsely punctate and reticulate rugose ( Fig. 5E ). First metasomal tergite as long as apically broad and projecting dorsally, its dorsal longitudinal carinae reaching middle of tergite and with a strong impression between carinae in basal part. Area between dorsal carina and spiracle with longitudinal impression. Spiracles projecting laterally. Subapical impression strong and slightly wider laterally than medially. First metasomal sternite 0.3 times as long as its tergite. Second metasomal tergite 0.5 times as long as apically broad, its transverse impression starting immediately after middle of tergite. Third tergite with weak transverse impression. Ovipositor sheaths weakly clavate ( Fig. 5G ) and 0.6 times as long as height of last visible tergite. Ovipositor stout at base with triangular shape before shallow subapical snotch, its lower valvae weakly swollen before thin tip and tip of upper valve after notch 0.28 times as long as ovipositor length ( Fig. 5G ).

Colouration: body mostly black ( Fig. 5 ); antennal flagellomeres and pterostigma brownish; clypeus, legs (except coxa, hind tibia and tarsus), and second and third metasomal sternites reddish.

Male

Morphologically similar to female, but with clypeus shorter (0.3 times as high as wide) ( Fig. 5B ) and upper tooth of mandible slightly longer than lower. Parameres broad basally and weakly elongate apically, extending beyond aedeagus, volsella moderately large with apical notch, aedeagus apically downcurved ( Fig. 5C ).

Colouration as in female, but middle tergites sometimes with red spots. Face, clypeus, malar space, mandibles (excluding teeth), upper part of scape, flagellum ventrally, fore and middle coxae and trochanters, lower part of propleuron, hind angle of pronotum, tegulae and sternites yellow.

Host records

Nematus alniastri (Scharfenberg, 1805) , N. grandis (Serville, 1823) , N. latipes Villaret, 1832 , N. septentrionalis (Linné, 1758) , N. papillosus (Retzius, 1783) , N. pavidus Serville, 1823 , Heterarthus microcephalus (Klug, 1818) .

Distribution

Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Hungary, Ireland, Latvia, the Netherlands, Norway, Poland, Russia (Kursk, St. Petersburg, Tambov Regions), Sweden, U.K.

Figures

Fig. 5. Rhinotorus compactor (Thumberg, 1822). A. ♀ face. B. Ƌ face. C. Ƌ genitalia. D. Propodeum. E. Metasoma dorsally. F. Head dorsally. G. Ovipositor. H. Mesopleuron. I. Habitus.